(a) The area shaded pink on the photo shows landscape features of peneplanation (in an exam, if you are given a photo, I would recommend you draw on the photo as I have done)
The landscape features that indicate this are the relatively level surface cut by steep sided valleys (the Taiere Gorge)
(Note: the peneplain surface actually continues into the far distance; the mountain range you can see is bounded by a fault which has uplifted the peneplain surface to form a 'basin and range' landscape.) On the right of the photo are younger rocks that post-date the peneplanation.
(b) these rocks have undergone regional metamorphism because of heat and pressure. They were buried to great depths (14+ km) during the Rangitata Deposition Period and were uplifted during the Rangitata Orogeny. During the Rangitata Orogeny and in the post-Rangitata eriosional (peneplanation) event, the overlying 14 km of rock have been worn away to expose these very 'deep down' rocks. This is part of the evidence for an orogeny.
Answer to peneplanation question:
(a) The area shaded pink on the photo shows landscape features of peneplanation (in an exam, if you are given a photo, I would recommend you draw on the photo as I have done)
The landscape features that indicate this are the relatively level surface cut by steep sided valleys (the Taiere Gorge)
(Note: the peneplain surface actually continues into the far distance; the mountain range you can see is bounded by a fault which has uplifted the peneplain surface to form a 'basin and range' landscape.) On the right of the photo are younger rocks that post-date the peneplanation.
(b) these rocks have undergone regional metamorphism because of heat and pressure. They were buried to great depths (14+ km) during the Rangitata Deposition Period and were uplifted during the Rangitata Orogeny. During the Rangitata Orogeny and in the post-Rangitata eriosional (peneplanation) event, the overlying 14 km of rock have been worn away to expose these very 'deep down' rocks. This is part of the evidence for an orogeny.